Erlangen 2026 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 44: Invited Topical Talks II

T 44.3: Invited Topical Talk

Mittwoch, 18. März 2026, 14:45–15:15, MED 00.915

Rare B meson decays at Belle II: indirect searches for new physics at the luminosity frontier — •Ana Luisa Moreira de Carvalho — DESY, Hamburg, Germany

There is a lot we still do not understand about the Universe and its evolution. A striking example is the observed asymmetry in the quantity of matter and antimatter, which, together with other experimental evidence, points to physical processes and/or particles not contemplated in our current theoretical framework (the Standard Model).

Despite extensive searches at the LHC, the highest energy particle collider available, no evidence of physics beyond the Standard Model has been observed, indicating that new physical phenomena may lie beyond the energy reach of current experiments.

In this context, indirect searches - based on precision measurements and the study of rare Standard Model processes - provide a powerful and complementary approach. These studies require very large data samples, such as those produced in high-luminosity electron-positron collisions at the SuperKEKB accelerator, where the Belle II detector operates. At Belle II, rare electroweak transitions of a b-quark into an s-quark can be studied as sensitive probes of physics beyond the Standard Model. Additionally, precise measurement of the differences in the transition properties of a b-quark and an anti-b-quark may shed light on the mechanisms responsible for the matter-antimatter asymmetry in the present Universe.

Keywords: electroweak; SuperKEKb; Belle II; B meson